adiabatic wall boundary condition
 

Hello

I'm using ANSYS CFX v12 to simulate the fluid flow and heat transfer in a rectangular duct. I impose an adiabatic wall boundary condition to the top surface of the fluid domain and a constant heat flux to the bottom one. The logical result is the absence of heat transfer near the upper wall. Instead the results I get show that the fluid is also heated from the top (adiabatic?!) wall. I have checked my boundary conditions and they are ok. Could the problem be related to the mesh? Any suggestions would be highly appreciated.

Thanks!

No, an adiabatic wall should not heat no matter what you do.

What makes you think the adiabatic wall is heating it?

Thank you for your swift reply!
Unfortunately, I didn't interpret my results correctly. The fluid is heated due to the effect of the lateral wall. I was confused because the heating took place near the vicinity of the upper boundary. Sorry to trouble you!